常压下镍酸盐中高温超导性的探索
The Quest for High-Temperature Superconductivity in Nickelates under Ambient Pressure.
作者信息
Aggarwal Leena, Božović Ivan
机构信息
Brookhaven National Laboratory, Upton, NY 11973, USA.
Department of Chemistry, Yale University, New Haven, CT 06520, USA.
出版信息
Materials (Basel). 2024 May 25;17(11):2546. doi: 10.3390/ma17112546.
Recently, superconductivity with ≈ 80 K was discovered in LaNiO under extreme hydrostatic pressure (>14 GPa). For practical applications, we needed to stabilize this state at ambient pressure. It was proposed that this could be accomplished by substituting La with Ba. To put this hypothesis to the test, we used the state-of-the-art atomic-layer-by-layer molecular beam epitaxy (ALL-MBE) technique to synthesize (LaBa)NiO films, varying and the distribution of La (lanthanum) and Ba (barium). Regrettably, none of the compositions we explored could be stabilized epitaxially; the targeted compounds decomposed immediately into a mixture of other phases. So, this path to high-temperature superconductivity in nickelates at ambient pressure does not seem promising.
最近，在极端静水压力（>14 GPa）下，在LaNiO中发现了约80 K的超导性。对于实际应用，我们需要在常压下稳定这种状态。有人提出，可以通过用Ba替代La来实现这一点。为了验证这一假设，我们使用了最先进的逐层分子束外延（ALL-MBE）技术来合成(LaBa)NiO薄膜，改变La（镧）和Ba（钡）的含量及分布。遗憾的是，我们探索的所有成分都无法外延稳定；目标化合物立即分解为其他相的混合物。因此，在常压下镍酸盐中实现高温超导的这条途径似乎没有前景。
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